BIRM-166’s Short Thaw
Archived: 4 October 2026
Around 30,295 BCE, Ireland has no datable historical events; evidence instead records Late Pleistocene environments over broad periods. At Derryvree, County Fermanagh, the BIRM-166 freshwater deposits, bracketed by glacial tills, indicate an ice-free or ice-distant interval within MIS 3. Fossils reveal open tundra wetland, with aquatic plants, sedges, mosses and cold-adapted species. Castlepook Cave, County Cork, preserves mixed, repeatedly deposited remains of mammoth, reindeer, giant deer, predators and other fauna, demonstrating wider European connectivity. A possibly cut-marked reindeer bone may indicate human activity, but no secure settlement evidence exists. Ireland remained an environmentally dynamic, glaciated northern fringe through unstable climates.